/* Software License Agreement
 * 
 *     Copyright(C) 1994-2019 David Lindauer, (LADSoft)
 * 
 *     This file is part of the Orange C Compiler package.
 * 
 *     The Orange C Compiler package is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     The Orange C Compiler package is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License
 *     along with Orange C.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *     As a special exception, if other files instantiate templates or
 *     use macros or inline functions from this file, or you compile
 *     this file and link it with other works to produce a work based
 *     on this file, this file does not by itself cause the resulting
 *     work to be covered by the GNU General Public License. However
 *     the source code for this file must still be made available in
 *     accordance with section (3) of the GNU General Public License.
 *     
 *     This exception does not invalidate any other reasons why a work
 *     based on this file might be covered by the GNU General Public
 *     License.
 * 
 *     contact information:
 *         email: TouchStone222@runbox.com <David Lindauer>
 * 
 */

#include <io.h>
#include <dos.h>
#include <errno.h>
#include <sys\locking.h>

int _RTL_FUNC locking(int __handle, int __cmd, long __length)
{
   long ft = tell(__handle) ;
   int i ;
   if (ft == -1)  /* will catch invalid handle */
      return -1 ;
   switch(__cmd) {
      case LK_LOCK:
      case LK_RLCK:
         for (i =0; i < 10; i++) {
            if (! lock(__handle, ft, __length))
               return 0 ;
            sleep(1) ;
         }
         errno = EDEADLOCK ;
         return -1 ;
      case LK_NBLCK:
      case LK_NBRLCK:
         return lock(__handle, ft, __length) ;
      case LK_UNLCK:
         return unlock(__handle, ft, __length) ;
      default:
         errno = EINVAL ;
         return -1 ;
   }

}
int _RTL_FUNC _locking(int __handle, int __cmd, long __length)
{
    return locking(__handle, __cmd, __length);
}
